what other buildings/graphics it has that would be good to port
O cool!
Beside already ported things personaly I like "black" inserters and K2's equipment. Like portable nuclear reactor, better batteries and maybe laser defences (but with vanila power drow balance) etc. Also extra egines for tanks/trains are good (and K2 Tank that you discused up in thread will not work without them beacuse it is VERY slow by default).
Aditionaly you might look on K2 furnace, but I like SE's "Industrial furnace" more (yes it's slover but same amount of modules and not so huge as K2's — vell it may be a minus with vanila beacon balance, so I would recomend this mod https://mods.factorio.com/mod/wret-beacon-rebalance-mod for your better factorio expirience)